The Doctor describes them as prehistoric mammals, but not from this world.

It is believed to be the first such recovery of the prehistoric, elephant-like mammals in more than 10 years.

We currently have videos and information on 27 Prehistoric Mammals.

This is the only prehistoric mammal in the film besides the Pithecanthropus.

These prehistoric mammals are related to the elephant and, more distantly, the sea cow.

Roth was encouraged to continue finding and collecting rare prehistoric mammals as a profession.

The Deinotherium or 'terrible beast' was a large prehistoric mammal similar to modern day elephants.

They are like old tools, or prehistoric mammals, or the laboratory equipment essential to industrial progress and waste.

Saber-tooth tiger, a common name for several unrelated prehistoric mammals (see there)

Large prehistoric mammals, for instance, are variously described as being "awkward" or "witless".